MAX1624EAG ,High-Speed Step-Down Controllers with Synchronous Rectification for CPU PowerELECTRICAL CHARACTERISTICS(V = V = D4 = +5V, PGND = AGND = D0–D3 = 0V, R = 33.3kΩ, T = 0°C to +85°C ..
MAX1625 ,High-Speed Step-Down Controllers with Synchronous Rectification for CPU PowerApplicationsVV DDCCPentium Pro™, Pentium II™, PowerPC™, Alpha™,TO AGNDand K6™ SystemsCSHDesktop Com ..
MAX1625ESE ,High-Speed Step-Down Controllers with Synchronous Rectification for CPU Powerfeatures such as a digitally programmable out-' Current-Mode Feedbackput in 100mV increments; adjus ..
MAX1625ESE+ ,High-Speed Step-Down Controllers with Synchronous Rectification for CPU PowerApplicationsVV DDCCPentium Pro™, Pentium II™, PowerPC™, Alpha™,TO AGNDand K6™ SystemsCSHDesktop Com ..
MAX1626 ,5V/3.3V or Adjustable, 100% Duty Cycle, High-Efficiency, Step-Down DC-DC ControllersApplications• External P-Channel MOSFET Allows Output Power• Handheld Computersof > 12.5W• High-Eff ..
MAX1626ESA ,5V/3.3V or Adjustable / 100% Duty-Cycle / High-Efficiency / Step-Down DC-DC ControllersMAX1626/MAX162719-1075; Rev 0; 6/965V/3.3V or Adjustable, 100% Duty-Cycle, High-Efficiency, Step-Do ..
MAX4365ETA+ ,1.4W and 1W, Ultra-Small, Audio Power Amplifiers with ShutdownFeaturesThe MAX4364/MAX4365 are bridged audio power♦ 1.4W into 8Ω Load (MAX4364)amplifiers intended ..
MAX4365ETA+T ,1.4W and 1W, Ultra-Small, Audio Power Amplifiers with ShutdownELECTRICAL CHARACTERISTICS—5V(V = 5V, R = ∞, C = 1µF to GND, V = V , T = +25°C, unless otherwise no ..
MAX4365ETA-T ,1.4W and 1W, Ultra-Small, Audio Power Amplifiers with ShutdownApplicationsMARKMAX4364ESA+ -40°C to +85°C 8 SO —Cellular PhonesMAX4365EUA+ -40°C to +85°C 8 µMAX — ..
MAX4365EUA ,1.4W and 1W / Ultra-Small / Audio Power Amplifiers with ShutdownFeaturesThe MAX4364/MAX4365 are bridged audio power 1.4W into 8Ω Load (MAX4364)amplifiers intended ..
MAX4366EUA+ ,330mW, Ultra-Small, Audio Power Amplifiers with ShutdownApplicationsMAX4366EBL-T -40°C to +85°C 8 UCSP-8 AAKCellular PhonesMAX4366EKA-T -40°C to +85°C 8 SO ..
MAX436CPD ,Wideband Trasconductance AmplifiersFeatures
. 275MHz Bandwidth (MAX435)
. tb50Wps Slew Rate
ta
. No Feedback
. True Differentia ..
MAX1624EAG-MAX1625ESE
High-Speed Step-Down Controllers with Synchronous Rectification for CPU Power
_______________General DescriptionThe MAX1624/MAX1625 are ultra-high-performance,
step-down DC-DC controllers for CPU power in high-end
computer systems. Designed for demanding applications
in which output voltage precision and good transient
response are critical for proper operation, they deliver
over 35A from 1.1V to 3.5V with ±1% total accuracy from
a +5V ±10% supply. Excellent dynamic response cor-
rects output transients caused by the latest dynamically
clocked CPUs. These controllers achieve over 90% effi-
ciency by using synchronous rectification. Flying-capaci-
tor bootstrap circuitry drives inexpensive, external
N-channel MOSFETs.
The switching frequency is resistor programmable from
100kHz to 1MHz. High switching frequencies allow the
use of a small surface-mount inductor and decrease out-
put filter capacitor requirements, reducing board area
and system cost.
The MAX1624 is available in a 24-pin SSOP and offers
additional features such as a digitally programmable out-
put in 100mV increments; adjustable transient response;
selectable 0.5%, 1%, or 2% AC load regulation; and gate
drive for a current-boost MOSFET. The MAX1625 is resis-
tor adjustable and comes in a 16-pin narrow SO pack-
age. Other features in both controllers include internal
digital soft-start, a power-good output, and a 3.5V ±1%
reference output. For a similar controller compatible with
the latest Intel VRM/VIDspecification, see the MAX1638*
data sheet.
________________________ApplicationsPentium Pro™, Pentium II™, PowerPC™, Alpha™,
and K6™ Systems
Desktop Computers
LAN Servers
Industrial Computers
GTL Bus Termination
____________________________FeaturesBetter than ±1% Output Accuracy Over
Line and Load90% EfficiencyExcellent Transient ResponseResistor-Programmable Fixed Switching
Frequency from 100kHz to 1MHzOver 35A Output CurrentDigitally Programmable Output from 1.1V to 3.5V
in 100mV Increments (MAX1624)Resistor-Adjustable Output down to 1.1V
(MAX1625)Remote SensingAdjustable AC Loop Gain (MAX1624)GlitchCatcher™Circuit for Fast Load-Transient
Response (MAX1624)Power-Good (PWROK) OutputCurrent-Mode FeedbackDigital Soft-StartStrong 2A Gate DriversCurrent-Limited Output
MAX1624/MAX1625
Synchronous Rectification for CPU Power
Pin Configurations appear at end of data sheet.*Future product.
Pentium Pro and Pentium II are trademarks of Intel Corp.
PowerPC is a trademark of IBM Corp.
Alpha is a trademark of Digital Equipment Corp.
K6 is a trademark of Advanced Micro Devices.
GlitchCatcher is a trademark of Maxim Integrated Products.
MAX1624/MAX1625
High-Speed Step-Down Controllers with
Synchronous Rectification for CPU Power
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VDD= VCC = D4 = +5V, PGND = AGND = D0–D3 = 0V, RFREQ = 33.3kΩ, TA
= 0°C to +85°C, unless otherwise noted.) Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
VDD, VCC, PWROK to AGND......................................-0.3V to 6V
PGND to AGND..................................................................±0.3V
CSH, CSL to AGND....................................-0.3V to (VCC+ 0.3V)
NDRV, PDRV, DL to PGND.........................-0.3V to (VDD+ 0.3V)
REF, CC1, CC2, LG, D0–D4, FREQ,
FB to AGND................................................-0.3V to (VCC + 0.3V)
BST to PGND............................................................-0.3V to 12V
BST to LX....................................................................-0.3V to 6V
DH to LX.............................................(LX - 0.3V) to (BST + 0.3V)
Continuous Power Dissipation (TA= ±70°C)
24 Pin SSOP (derate 8.00mW/°C above +70°C)..........640mW
16 Pin Narrow SO (derate 8.70mW/°C above 70°C).....696mW
Operating Temperature Range
MAX162_E_ _.......................................................-40°C to +85°C
Storage Temperature Range.............................-65°C to +125°C
Lead Temperature (soldering, 10sec).............................+300°C
ELECTRICAL CHARACTERISTICS (continued)(VDD= VCC = D4 = +5V, PGND = AGND = D0–D3 = 0V, RFREQ = 33.3kΩ, TA
= 0°C to +85°C, unless otherwise noted.)
MAX1624/MAX1625
High-Speed Step-Down Controllers with
Synchronous Rectification for CPU Power
MAX1624/MAX1625
High-Speed Step-Down Controllers with
Synchronous Rectification for CPU Power
ELECTRICAL CHARACTERISTICS(VDD= VCC= D4 = +5V, PGND = AGND = D0–D3= 0V, RFREQ = 33.3kΩ, TA
= -40°C to +85°C, unless otherwise noted.) (Note 4)
Note 1:FB accuracy is 100% tested at FB = 3.5V (code 10000) with VCC= VDD= 4.5V to 5.5V and CSH - CSL = 0mV to 80mV. The
other DAC codes are tested at the major transition points with VCC= VDD= 5V and CSH - CSL = 0. FB accuracy at other
DAC codes over line and load is guaranteed by design.
Note 2:FB set voltage is 100% tested with VCC= VDD= 4.5V to 5.5V and CSH - CSL = 0mV to 80mV.
Note 3:AC load regulation sets the AC loop gain, to make tradeoffs between output filter capacitor size and transient response,
and has only a slight effect on DC accuracy or DC load-regulation error.
Note 4:Specifications from 0°C to -40°C are not production tested.
MAX1624/MAX1625
High-Speed Step-Down Controllers with
Synchronous Rectification for CPU Power
__________________________________________Typical Operating Characteristics(TA = +25°C, using the MAX1624 evaluation kit, unless otherwise noted.)
MAX1624/MAX1625
High-Speed Step-Down Controllers with
Synchronous Rectification for CPU Power
____________________________Typical Operating Characteristics (continued)(TA = +25°C, using the MAX1624 evaluation kit, unless otherwise noted.)
MAX1624/MAX1625
High-Speed Step-Down Controllers with
Synchronous Rectification for CPU Power
____________________________Typical Operating Characteristics (continued)(TA = +25°C, using the MAX1624 evaluation kit, unless otherwise noted.)
MAX1624/MAX1625
High-Speed Step-Down Controllers with
Synchronous Rectification for CPU Power
______________________________________________________________Pin Description
MAX1624/MAX1625
High-Speed Step-Down Controllers with
Synchronous Rectification for CPU PowerFigure 1. MAX1624 Standard Application Circuit
MAX1624/MAX1625
High-Speed Step-Down Controllers with
Synchronous Rectification for CPU PowerFigure 2. MAX1625 Standard Application Circuit
MAX1624/MAX1625
High-Speed Step-Down Controllers with
Synchronous Rectification for CPU Power
Table 1. Component List for Standard 3.3V Applications by Load Current*
(Output Voltage = 3.3V, Frequency = 500kHz)*MAX1624:LG = REF, D4–D0 = 10010.
MAX1624/MAX1625
High-Speed Step-Down Controllers with
Synchronous Rectification for CPU Power*Distributor
†See Table 4 for a complete listing.
Table 2. Component SuppliersTable 3. MAX1624 Output Voltage
Adjustment Settings (Abbreviated†
)
_____Standard Application CircuitsThe predesigned MAX1624/MAX1625 circuits shown in
Figures 1 and 2 meet a wide range of applications with
output currents up to 12A and higher. Use Table 1 to
select components appropriate for the desired output
current range, and adapt the evaluation kit PC board
layout as necessary. Table 2 lists suggested vendors.
These circuits represent a good set of trade-offs
between cost, size, and efficiency while staying within
the worst-case specification limits for stress-related
parameters, such as capacitor ripple current.
These MAX1624/MAX1625 circuits were designed for
the specified frequencies. Do not change the switching
frequency without first recalculating component val-
ues—particularly the inductance, output filter capaci-
tance, and RC1 resistance values. Recalculate the
voltage-feedback resistor and compensation-capacitor
values (CC1 and CC2) as necessary to reconfigure
them for different output voltages. Table 3 lists voltage
adjustment DAC codes for the MAX1624.
_______________Detailed DescriptionThe MAX1624/MAX1625 are BiCMOS switch-mode,
power-supply controllers designed for buck-topology
regulators. They are optimized for powering the latest
high-performance CPUs—demanding applications
where output voltage precision, good transient
response, and high efficiency are critical for proper
operation. With appropriate external components, the
MAX1624/MAX1625 deliver over 15A between 1.1V and
3.5V with ±1% accuracy. The MAX1625 offers 1% typi-
cal transient-load regulation from a +5V supply, while the
MAX1624 offers a selectable transient-load regulation of
0.5%, 1%, or 2%. Remote output sensing ensures volt-
age precision by eliminating errors caused by PC board
trace impedance. These controllers achieve 90% effi-
ciency by using synchronous rectification.
A typical application circuit consists of two N-channel
MOSFETs, a rectifier, and an LC output filter (Figure 1).
At each of the internal oscillator’s rising edges, the
high-side MOSFET switch (N1) is turned on and allows
current to ramp up through the inductor to the output
filter capacitor and load, storing energy in a magnetic
field. The current is monitored by reading the voltage
